Analisis yuridis surat instruksi kepala daerah DIY no k 898 i a 1975 terhadap kepemilikan hak atas tanah bagi WNI keturunan Tionghoa di Wilayah Daerah Istmewa Yogyakarta = Judicial analysis of letter of instruction from diy regional head no k 898 i a 1975 on ownership of land for the citizens Chinese descendants in Yogyakarta special region